Portugal may not be as popular a destination as Spain, it's Iberian neighbor, but as a seasoned traveler looking to see stunning architecture and beautiful natural sights, you'll enjoy these planz to three beautiful Portuguese cites, Lisbon, Porto, and Cascais.

Off to Lisbon, Portugal, for a wonderful week long vacation in the Mediterranean. Your flight departs Tuesday afternoon and gets takes just under 11 hours to touch down across the Atlantic, followed by a short jump to Portugal.

Pre-arrange your airport transportation to make the post-airport transfer as easy as possible. Check in at the gorgeous Hotel Britania, and then spend the afternoon checking out a few sites, like the Castelo de São Jorge in the Alfama district, wh...

On Thursday, take advantage of Viator's super saver offer, a hop-on, hop-off tour with four separate routes that will take you to just about every Lisbon must-see. You can spend the whole day sightseeing and soaking in the Portuguese culture. For ...

Viator offers several fantastic day trips to the surrounding cities of Lisbon. Our top pick? A day-long excursion to Sintra, a city bursting with history and awe-inspiring architecture. Your tour also includes a complimentary Portuguese lunch and ...

Catch the early morning train from Lisbon to Porto, where you can drop your bags at the Sheraton Porto and enjoy an afternoon tour of the city, where you'll enjoy views of the city's gorgeous architecture, dating back to the Romanesque and Baroque...

A must-do in Porto is a Duoro Valley day trip, so let Viator take the reigns and enjoy everything the region has to offer, from wine tasting and lunch to sightseeing and even an optional cruise down the river. For dinner, a relaxed evening at Rest...

On to your next destination, the coastal town of Cascais! Take the south-bound train out of Porto and check into your glamorous hotel, the Cascais Miragem. Spend a leisurely day seeing the natural wonders of the city, like Boca do Inferno, a drama...

It's not all natural beauty in Cascais, there is also jaw-dropping architecture and history, like the Palacio Nacional de Queluz - a stunning display of rococo architecture. To end your trip to Portugal, grab a bite at the classic Cozinha Velha, a...